function tabulatedFib( n ) {
  // create a blank array with n reserved spots
  let table = newArray( n ); // seed the first two values 
  table[ 0 ] = 0;
  table[ 1 ] = 1; // complete the table by moving from left to right,
  // following the fibonacci pattern
  for ( let i = 2; i <= n; i += 1 ) {
    table[ i ] = table[ i - 1 ] + table[ i - 2 ];
  }
  return table[ n ];
}

console.log( tabulatedFib( 7 ) ); // => 13
